I owned iPhone 7 before and now X. Both share similar footprint and it's easy to carry. the X is slightly heavier but not big deal for me. Fit's very well in my pockets. I never used Plus for the same reason. The size is too big for my hands and it's hassle to carry around.
I don't have large hands, yet I find the Plus models to be "usable" one-handed, but I obviously prefer two handed for typing. I get it because I prefer the larger battery, better camera and of course the larger screen.
For me, and my age, I’ve never used it one-handed, always two regardless of the size. Better for my eyes as well. Nice battery life, and camera. Though it has two lenses I only use the wide-angle lens, never telephoto.
Love the width for video. Wider works better for me for two-handed typing. Can scroll/browse one-handed. Amazing battery life. More image on-screen for photo editing.